Gearbest is an online store with a large inventory, mostly focusing on electronics. Over the last 6 months, I have placed around 25 orders, and have been very happy with my shopping experience.
They have a large inventory, and a well made website. Unlike many other webstores, the items are actually in stock, and usually ship within 24 hours. Shipping is free on every item, and you can choose different shipping methods if you prefer.
The prices are often the lowest I see anywhere online, and the items I received were all authentic. Customer service is great, they speak perfect English, respond quickly, and always offer fair solutions.
Make sure to check out the flash sales, their sale prices are really good. With the free shipping and excellent customer service, it really is the best online Chinese store I have ever used.